After you file

Yes, I already paid my 2019 Tax due back on July 15th. The money was taken from my bank account. I just received the letter from IRS in the mail saying:

Tax you owed when you filed your return: $xxx

Total penalties (see page 3 for more information): $yyy

Payments and credits: $-xxx

Amount due by Sept 14th, $yyy

 

Page 3 has the following:

Penalty: Failure to pay properly estimated tax (Internal Revenue Code Section 6654)

Description: When you don't pay enough taxes due for the year with your quarterly estimated tax payments, we charge a penalty for not properly estimating your tax. 

 

It looks like the IRS is charging me for not paying the estimated tax for next year. I inadvertently selected to make quarterly payments for next year's tax and I am being charged now. How do I stop that? Is there a form I must file? Can I just call the IRS to stop this?